How To Make Coax Antennas (FM receiving) Folded Dipole
ฝัง
- เผยแพร่เมื่อ 28 ก.ย. 2024
- How to make a simple, good performing, and well matched VHF coax folded dipole antenna for receiving FM radio and TV signals. I use this one with my Video/Audio transmitter I made. I connect this to my TV.
Design Info Link:
www.nsw.wicen.o...
Link To Design Program:
www.dxzone.com...
**For GREAT deals(Usually cheaper than EBAY) on electronics, drones, automotive, home goods and MUCH more, please visit the link below. Your purchase supports my channel.
All Items: bit.ly/2cgYr14
Flash Deals: bit.ly/2cb6CZB
*Be sure to look online for money saving coupon codes!*
Thanks For Watching!
**If you enjoy watching my videos, please show your support by SUBSCRIBING, POSTING LINKS to my videos on other websites & blogs, rating a "THUMBS UP", and watching my video playlists. Doing so helps to ensure that many more videos will be released in the future. (Views are essential to ensure this channel remains in an active state)**
I tried one antenna for 98 MHz and it is working fine for the FM band. Thank you very much.
Thanks for that. I made mine for mid bandwidth, using maths from somewhere else.
This gave me a 95.66cm length for 98mhz bandwidth.
Works a treat right through the range wherever it's put.
this calc gives about 153cm for 98mhz.
FM receptions is great. Ohm reading at 83mhz = 50, at 95 = 200, at 107 = 50. Using RG6, would like avg closer to 75. I did not stip the ends completely. Stirpped back just enough to short the shield to the center.
ok, take 2. Trimmed each end and now get low of 60ohm and high of 107 at 99mhz. Problably as good as it gets
Well i just had the nerdiest Saturday night ever. My house is in a depression so i don't get very good radio reception, my favorite station is 94.7 and its weak anyway so i used the calculator, cut some RG-6, taped it to a dowel to stay straight, and wow does it work great. even if i get the coax feed near the antenna hookup everththing comes in great. I can pick up most stations up to .3 mhz side band. before i could only get like 1 or 2, now i have tons. Great project!
Yup this works awesome! I live in a rural area and before I could only tune a couple channels. Now I get something on almost every channel (95.7, 95.9, 101.1 etc) Not all are perfect but dozens and dozens are. It is great. Thank you
BTW I used the software recommended and put in 98.0 MHZ half way between 88 and 108
+jmanatee Glad my video was able to help you. Please share my videos with others and rate Thumbs Up.
Thanks!
Thanks, this works great. My favorite station is at 101.5, so I used the formula L = 93.75/f. to determine that I need the length to be 92.5 cm and copied your setup. it's much, much better than the antenna that came with the radio.
I just get thin speaker wire and wrap it around my window frame inside in my brick building for my vintage Marantz 2215b and it works great no need to get fancy
Whatever works! :-) Thanks for watching
Built mine and it works great.
Great to hear!
This all looks like a fairly simple and great way to make an antenna. One thing about the video I think I do not understand. You said at the T junction you take the center conductor of the feed and attach to the shield on one side and the shield from the feed and attach to the shield on the other. You said the cross piece center conductor stays in tact. That all sounds good but then you solder the shield to the center conductor at both ends which would "short" the center and shield of the feed. That is the part I think I am misunderstanding.
Refer to the link in the video description area. You will see images.
Thanks.
The shield is cut in the middle. Therefore an open, so not a short.
Too short ........... . According to the calculations I did following my manual it comes out that 1\4 λ corresponds to 66.66 cm.
It works, and VERY good.
Please can you help, I have a radio I have lost the antenna for, it has a male coax connection on the radio for the antenna and I need to make one to receive FM radio signal in England.
I tried wiring some coax to it with female connector and it only works if i strip the copper back and hold onto it!!?
Great project. Which direction should it point in relation to a transmitter for best results? Should the axis of the aerial be at a right angle to the direction from which the signal is coming or in line with it?
Dipoles have null points inline with the axis. You want the perpendicular to the length of the dipole pointed at your target, meaning the dipole can be mounted either vertically or horizontally.
@@demef758 wow - he had to wait 8 years for that info lol..
Thanks, man!
Glad you enjoyed the video! Be sure to check out my extensive video playlists for other great videos of interest to you, rate thumbs up, and share my channel with others.
Super
Hi, This about the video "Coax Antenna (FM receiving) Folded Dipole". I hv no clue about electronics but still wanted to build one for 98MHz (commercial FM band). I tried the software by VE3SQB for lengths but got all confused by Feet/Inches & Meters/CM. Can you please give me the figures in cms for the over-all length of the antenna (between the loops at each end). And also the length between the two solder joints (I guess it is velocity length). Looking forward to hear from you.
+SN N
Very simple, enter the frequency, then click the button for the measurement you want. IN, CM, etc. I have too many viewers and questions to be offering special assistance.
Thanks
Give me a break, I have been using a split coax dipole for years. No need for his design, Just split the sheath from the outer casing peel it away, discard, Then with a small screwdriver open the braided wire and seperate the shield and pull the center conductor through the braid. tack to a wall on both ends. no need to measure anything,Mine is 4 ft long on each end with enough left to attach to the TV.
Jason K If you don't like the design, or are too lazy to make something the right way, then don't use it. :-)
Read any article from anyone who makes fm antennas.😂😂 The length is very critical. It's extremely important to maximize the signal. Only an amateur with very little knowledge would say otherwise. The guy in this video is correct, and your insult is insulting yourself.
I'm just drunk and want the radio too work !!!
I'm still drunk, and made mine work with copper and coax..... whiskey down. bitches
Mark Eldridge Best Comment Ever
Same here
What's the full length from tip to tip if you want to cover the FM radio band 88 - 108mhz?
Design it for 98 mhz.
What if you want to boost the signal of the FM radio (I mean the regular
entertainment radio)? You have to calculate the length for each channel
and make multiple antenas for every channel? Thank you.
+Kketansa Art
No. Just make (1) antenna for the center of the band you're using.(98mhz) should be fine
electronicsNmore
Thank you :))
Please help me, I don't understand how to use the feet to Inch or Meter to Cm button in the application. Should i understood it by your help, I will be starting to cut the edges of the coax for a specific frequency. Thanks
If you use metric where you live, then just cinput the desired frequency, choose the correct coax wire, then click the Meter/cm button to give you all the dimensions in metric. Very easy.
Thanks For Watching!
The famous Bazooka antenna
Yes, and it works very well when made properly. Thanks for watching!
Does the coax shielding have to be copper? Why?
Easy to solder.
will this work on an am-fm car stereo
It should, or you can always make a FM stereo dipole antenna using 18-20ga speaker wire
You are 100% incorrect. This IS a folded dipole. Look up what a folded dipole looks like. LOL. This version does not have a wide space between the radiating loop.
we call that a double bazooka antenna in amateur radio operators lingo
anthony christian Jaen di un suo riscontro nella mia mente che non è una cosa che mi sono dimenticato di chiederti una cortesia di una persona che non è una cosa che mi sono accorto solo per la prima volta in cui si trova a pochi passi da Piazza San Marco di un mio amico ha fatto piacere di averti conosciuto come il tuo numero di telefono e telefonino cellulare che si chiama così come è andata bene il
o
All i can see in this video is 3 wires
as arms 2 wires. 1 radiating element, and a feed line. What were you expecting to see? Did you click the link in the video description area?
And how am I making dis?
were can you buy one of theses ?
You have to make one. This type of antenna is not common, but it certainly does work well.
Thanks For Watching!
Make sure you use coax that has copper shielding???. What the fuck Einstein all coax has copper shielding.????
No, Einstein. YOU are wrong.. As an example there's RG6 which has both aluminum foil shielding and aluminum braid shielding.
It’s a wire dude
What the hell is he saying when he says LENGTH?!?! He keeps saying lenth! At first I was like, what is he even saying or talking about?
Ah, another Troll.
@@electronicsNmore No, just someone who couldn't understand what the hell you were saying!
WHAT?
oh god, do not shield the antenna!
I guess you never heard of this type of antenna. LOL
damn, you're right! but is it efficient? www.hamuniverse.com/10metercoaxdipole.html
you're basically covering your copper! thats just bad
а поруски
тебе-то зачем?
Фёдор _ чтобы понять о чём речь.
если что, это был стёб над "поруски"
Do americans know there is an L in the word solder🤬
Why do Brits have mental issues as a result of how Americans pronounce words? Did it ever occur to you that we have no desire to be like you? LOL. After all, we fought a major battle in the USA to get your control freaks out of here.
Why is it that you electronics people cannot communicate any Info to anybody who has no fair knowledge on the subject ALREADY
Because the part of the brain required for successful communication among humans is sacrificed to understand this shit.
What were you having issues with? Also the answer is probably because you should have some kind of base level that you’ve gone and research or looked at before getting to this point.
Yep...electronics people .. they from a different world... really... they think everyone understands what are they saying...
But apply that to literally any vocation 🤷♂️
Thanks. made one of these today to slap on a radio i bought from the good will for 15$
It works. FM receiption is very good. I think it will work fine as TV antenna for analog tv.
What an amazing resource (the links). Learning more about antennas than I thought possible. Great work. Thanks
You're welcome! Be sure to check out my wide range of videos, and share. Thank you
@@electronicsNmore Can you use the coax design and connect it to one of those boxes that receive t.v. signal over the air? And would it improve the reception and bring in even more channels than waht the box brings in?
Thank you
First off, this is a CUSTOM antenna. It is made for a specific frequency. Secondly, I had all the supplies I needed laying around the house, thirdly....DON'T be lazy!
This is not a 'folded' aerial, just a straight single dipole which would give an impedance of around 75 ohms, a folded one would give you an impedance of 300 ohms.
Thanks for this, it worked like a charm!
Just made an antenna to work in the FM radio, tunned to the 98Mhz (middle of the fm radio scope +/-) and with this i can listen to my radios crystal clear, thanks once again.
Glad it also worked well for you. Be sure to check out my other videos, share, and rate a Thumbs Up.
Thanks!
Excellent plan, I was just wondering if I could use 2 conductor rca cable for the feed line, as the connector matches my radio or does it have to be coax? ( just makes for one less splice)
Thanks for video, very interesting. I have made loads of these and am still amazed at how they work and they do work well.
Glad you like them! They do work well when properly made. Thanks for watching! Be sure to rate thumbs up.
Finally got that .exe running in a Win 7 virtual machine. Hoping to build this today or tomorrow to get better reception from a local radio station that doesn't transmit with very much power.
Two things I'm still confused about:
1) The program features a list of very specific types of cable (e.g. RG-8 vs RG-8x vs RG-8 FOAM), and also shows the feedline as 50Ω. What effect can I expect from using a 75Ω coax? (Impedance still confuses the heck out of me).
2) Given that the shielding of the feedline is tied directly into the antenna, doesn't that mean the feedline is no longer shielded, and therefore its length should also be calculated?
Thanks to anyone who can help.
where is the link to the calculator? Thanks for posting this. Do you have any other links for understanding the math that makes antennas work? Thanks!!
As an electrician that is pressed for time and needed a quick solution to a simple problem, I'd like to thank you for posting a simple vid explaining the importance of the math along with a link. Me and my customer thank you👏
Glad it helped! Be sure to rate thumbs up, consider subscribing if you like a wide range of helpful and informative videos, and look over my extensive video playlists below for many other videos of interest to you. Taking one minute to share a link to my channel with others on social networking sites would be greatly appreciated. Thank you
th-cam.com/users/electronicsnmoreplaylists
Being totally ignorant about antennas and radio waves, I found some of the information confusing leaving me with questions.
1) From the calculator app, using 98.2 MHz, the center point of US FM broadcast frequencies, I should make an antenna with overall length of 60.1222". Given that length, should the length be measured from the tip of the exposed inner cable wire at each end?
2) The calculator didn't indicate the length of the bare inner cable wire at each end. Because you said that the length is critical, what should it be given my FM antenna frequencies?
3) In pointing out soldering the copper shielding braid to the inner cable wire, you mentioned that 'it' should be a specific length carefully measured. What length were you referring to? The length of the braid? Also, you didn't mention what I take to be shrink tubing that covers the braid to where it is soldered. ??
That is *NOT A FOLDED DIPOLE* - you are using the wrong words to describe a dipole.
A folded dipole is a loops of wire flattened out and spaced, then fed at one side.
This is a dipole.
It's considered a folded dipole. Why? Because of how the center conductor of the coax and the braided shield are connected or looped. If you have a problem with this antenna, then take it up with the designer.
Trying to understand this...
My FM is going from 87,5 to 108 and I want to make an antenna for my Receiver.
From what I have understood and using COAXIAL DIPOLES by VS3SQB
Input FM 108 (middle of the FM band) - I get that I need a coaxial at 1.39 cm
Am I close?
And Do I need to expose some of the ends depending on the coaxial type?
Hi, great posting and thank you. However I have one question. If the FM band has bandwidth from 88 MHz to 108 MHz, using Coaxial Dipoles by VE3SQB require to have a specific input. That means the antenna will perfectly work with specific frequency. Difference on cable length for 88 MHz OD: 1.7m / ID: 1.27m, and for 108 MHz OD: 1.38m / ID: 1.4m. What is the best length or frequency to use to have most of FM band reception ok. Thanks
Choose the middle of the band.
Didn't understand a word. How are we supposed to know what's behind all that plastic & insulation?
What are you talking about? I just watched the video again. It was very clear what I said. You must not be familiar with coax. I also included a link in the video description area which shows IN DETAIL the connections. I suspect you did not go to that link. No one else complained.
:)
Somehow I missed the link to the calculator??
How is this a folded dipole? Looks like regular dipole.
Just made this. So if you solder both wires at ends of the top wire, the receiving end is shorted, correct? It makes no difference with the short wire from the Yamaha amp I tried...
Try orienting your T antenna 90 degrees to make it a side fed, vertically polarized omnidirectional antenna! Maybe do that in a follow up video. 🙂
I think others have tried that and determined that horizontal is best. Thanks for watching!
Have you heard of plagiarism????ĺ
What is the formula for the length? Where do I find the link, please. Thank you.
3,000,000/mHz frequency=meters something like that
@@furonwarrior The first number is supposed to be the speed of light in km/s and the second number is supposed to be your desired resonant frequency. I think you may have left out two zeros and also added a m to your Hz. Alternatively you may have added 4 zeroes, depending on wether you want to calculate using Hz or MHz.
L = 300 000 000 / frequency in Hz. Alternatively L = 300 / frequency in MHz.
i just used an audio cable and plugged it in :]
You seem your happy with the performance, however i disagree on a few key points... Yes you need shield on your feeder of it will act like part of the antenna, your ANODE and ELECTRODE as they are called, in a simple dipole, do NOT need shield and can just be the copper center rod. both sides. the center is an isolator and can just be a non-conductive any old thing... pvc plastic, rubber hose, Plexiglas square. I would also avoid the connected loops at the ends, i know you want a place to hold it or tie it up however is gets sloppy on your length calculations and the actually physical characteristics in calculating how they truly behave with lines of flux could fill volumes. In basic science you always want to give a relative comparison. it received FM signals well as compared to what? NO antenna/ Reynolds wrap? twisted uncut coat hanger? You get the idea. Based on your video you really could use the $1.99 Wal-Mart special(or $1 at a dollar store and probably do better. Focus on what makes a good transmitter antenna and apply the same rules, because the rules are the same... Thanks for reading...
Nothing to disagree with. The design wasn't mine, and it works very well. If you think a Walmart or dollar store $1 - $2 antenna will work better, then you need to find another channel to watch. Thanks
hallo.i have a 3c-2v coax cable but the antenna calculator does not have this option,what should i pick?and diference bettwen foam or not?how could i tell?(scuze my englisch)
Are you from Boston or New York?
I DON'T KNOW ANYTHING ABOUT ANTENNAS. BUT I ONCE USED A COATED WIRE FASTENER FROM ANY OF YOUR KIDS TOYS PACKAGES. LIKE A TWIST TIE.
Thanks for the video. The calculator program linked gives the over-all length calculation, but it does not seem to give me calculations for the solder points that you mention are also critical. Am I missing something?
The program gives the total length and length from soldered point to soldered point. Thanks for watching!
@@electronicsNmore Thanks for answering my dumb guy question. I missed the program's "SELECT COAX FOR
VELOCITY LENGTH FORMULA" Box. Kinda important.
I think antenna support ends not ...
I want to make this but the calculator site is not working
+1
@@satamototo Yea Im looking for the math too Can anyone help ?
Good to hear! Check out my other videos as well.
What would be your measurements of the antenna? good video
Soder? WTF try solder
Why can't Americans pronounce "solder" correctly? Fun fact: The 'L' in solder is not silent.
What can't Brits, Aussies, Kiwis, S. Africans, and others get it into their thick heads that the USA is not UK, AU, or NZ? If you ask me, they need to see a shrink over this. Tired of reading the stupid posts.
Very nice antenna, although correct me if I'm wrong, but that's not folded dipole antenna. It's an ordinary dipole with matching circuit made with two pieces of coax. At 2:30 it's said it also matches balanced to non-balanced line. Has someone tried how it works with respect to that? You can have impedances matched but when symmetry is not converted you end up with your feeder shielding acting as a radiating element and the efficacy of the antenna depends on the feeder length.
I didn't design the antenna, but I can say it works very well. Thanks for watching! Be sure to rate thumbs up, check out my extensive video playlists, and share.
it worked
1K Like! I am going to build!!
Great to hear Justin! It works well when properly made. Be sure to check out my extensive video playlists below, rate thumbs up, and share the video link on social networking websites. Thanks
th-cam.com/users/electronicsnmoreplaylists
I finished it. It works great and I have it mounted vertically behind my TV. It was a little tricky to do because the coax that I found had foil shielded thin delicate copper wire. I built it for 98MHz and now I can pick up stations that I could not before.
i am from Bangladesh. I need a fm radio receiving antenna (dipole antena)
will be sent
@@bijankumardas4153 can you sent me?
All good except I was left wondering what a sodder point was. Ok, it is an accent thing and he was trying to pronounce solder, but really sodder!
Stop telling Americans how to pronounce words. It's very rude, and shows how ungrateful you are. If it wasn't for American lives and firepower, the UK would be part of Nazi Germany today, that's a fact.
This is probably going to sound stupid and impractical, but I've always been curious about this, so I'll ask anyway. If I were to make this antenna or even a simple dipole antenna made from old-fashioned twinlead (made a few of those in the past), and found a way to waterproof and stabilize it for outside mounting, would I get decent reception by putting it at a height of, say, 20 feet?
Higher is better. Just make sure the antenna is properly made for the frequency you desire, or in the middle of a range that you desire.
Thanks For Watching! Be sure to rate thumbs up, and share.
electronicsNmore
Thanks. A thumbs up for that answer!
This is a great video. You make a reference to a calculator but I don't see the link to it. Can you please post the list again. Thanks.
Look under the video in the "About" section. Don't forget to share, and rate a thumbs up.
Thanks For Watching!
anybody?
haha, i'm a moron, i just had to click on "more" to get the link.
I tried and tried and could not find where I could buy copper braid coaxial cable.
I had no luck with Amazon, Ebay, the Radio Shack that was open, Target, Best Buy.
Any ideas?
---- Will the coax with steel braiding suffice as a dipole antenna?
I learned that RG58 and RG8 correspond to 50 ohm and...
-----------------------RG59 and RG6 are 75 ohm.
Thanks
+David Barth
If you cannot find copper shielded coax, then use the readily available aluminum braided type. Since you will not be able to solder the aluminum braiding, just use "uninsulated butt crimp splices". You can buy them on Ebay fairly cheap. Just make sure the I.D. of the butt splice is large enough for the braid and center conductor. Slide it over, then crimp.
rg58 and 8 have copper braid
Glad it worked well for you!
Nice info but not much good if you don't put the measurements in. I just need a simple FM antenna and I am not a radio head.
You need to use the calculator provided. Enter the frequency desired, and presto!
So, wait a second, there's one appropriate length for a desired frequency, correct? I would assume that's the overall length of the antenna, so what is the relationship between the length from solder point to solder point and attenuated frequency?
Hi Ryan. The antenna works fine for the entire FM radio band if you make it for the middle of the band(98.5mhz), but the best result is when you make it for the EXACT frequency. Please refer to the link in the video description area for more info. Thanks for watching!
A ha now I see nice job are you sure of your measents What freq is it cut for
I am not good at electronics. I kinda fumble through it until I get it right. But I don't see how this will work. I am probably wrong, but you soldered both ends to the center conductor. To me, that greats a dead short?
+Derek H there's really no circuit to short, it's just catching FM energy from air to hit the metal on each side and get amplified in the receiver. All lengths of metal in this grab it.
+Derek H It's a loop! So in that sense, yes, it's a short circuit. If you think of it as a DC circuit with electricity flowing into the antenna through the shielding on the cable that runs from the radio to the antenna, that electricity then feeds into the shield on one of the two branches of the "T", then back through the center conductor and out to the end of the other other branch of the "T", then in to the center of the "T" through the shielding of that branch, and finally to the center conductor in the cable that runs back to the radio.
Of course, this is not a DC circuit, it's an AC circuit. And the point of the circuit is to get as much electricity to flow through the loop as possible at a given frequency. It's called resonance, and the circuit is tuned to the resonant frequency by adjusting the length of the antenna.
I didnt understood about the length. Which it should be for each part? How could I calculate it?
Link in the video description area.
The math is fairly simple. Wavelengths (in feet): Quarter- 234, Half - 468, Full- 936. You can do one-eighth and so forth but start with Quarter, Half, and Full until you get use to making them and understand when to use which for particular application. Typically Half is ideal for reception and size. Here is formula..... Wavelength (in feet) = 234 / frequency. Now multiply result by twelve (12 inches) to know how many inches it is. The formula is example of quarter wavelength so substitute that number for however long you what antenna or maximum size that can be used based on available area where antenna will be installed. The antenna is video is shaped like a dipole antenna but functions like a loop antenna. The shape of antenna will have an effect on bandwidth and interference (long story short). Google "Radio Operators Handbook" (MCRP 3-40.3B / FMFM 3-36) it should be first result. This will get you going on understanding antennas and radio waves. These "tight circles" are sometimes referred to as "loading coils" and can be used at the base of an antenna to reduce the overall length above the coil if there is very limited space or discretion is desired.
Thanks for your sharing. However, Best would be show exact step-by-step of construction for one example say 99 MHz. Also, The website calculator page is confusing. Says add 2 ft. To calculation but the talks about extra 6” on each side. Which is only 1 ft. Total. I think this is why you got so many thumbs down. You could really do a lot more w this.
The thumbs down were from people that either didn't like the design of the antenna, couldn't use the Windows OS antenna calculator program link I provided, or Trolls. The antenna works well, and I thought the instructions were fairly easy to understand. If a person had trouble making the antenna, then all they had to do was ask a simple question in the comment area, if they clicked "Thumbs Down", that was a confirmation of their stupidity. I'll take a closer look at the link. Thanks for watching!
electronicsNmore I have no doubt the antennae works well - which is why I was hoping you could provide better instructions on how to build. Even if you don’t want to take the time to do a video, photographs every step of the way would be helpful. Steps: doing the calculation for typical coax such as rg -59, rg-6; adding additional length; cutting and stripping the wire, creating the plastic centerpiece, connecting the center feed to the two legs, doing the soldering, etc.
It's fairly straight forward. Download the program, enter the frequency desired, then use the images as a guide. For best results use braided copper as the shielding.
it is a folded dipole.... cut for the band ...
probably the impedance may be over 200 ohms but for receiving its ok. as a compromise 5 minute quick set up antenna
+Teletenna Tech
Whatever it is, it certainly works well. Thanks For Watching
thank you !
Why do you say to make sure that the coaxial cable for the antenna has copper braiding, that is, a copper shield? If the braiding is steel wire, then that won't work?
You can only solder copper shielding.
@@electronicsNmore Not so, there is no problem soldering steel wire. Really I prefer copper, but by mistake I got some steel stranded hook-up wire which I solder all the time to copper foil or to a steel terminal. The solder that I'm using in doing that is 60/40 tin/ lead.
Some coaxial cable that I have on hand has a braided steel shield and I would think that steel is more common than copper. I could be wrong about that as I work very little with coaxial cable.
@@petel2869 I was talking about aluminum.
a bit confused, is the baided shielding soldered to the solid core lead at each end?
and which measurement is which? what is the top width measurement?
Yes. The braided shielding is soldered at each end to the solid wire core. Use the provided links to get measurements for your antenna. Thanks
@@electronicsNmore Got `er done, This does work great.
Antennas won't receive anything without a tuning circuit, look up resonant frequencies.
What are you talking about? LOL
Bazooka is another name. Correct.
Watched multiple times and did some investigating to try to learn which "RG" Number relates to the ohm value.
It seems 50 ohm is optimum for FM listening. Can I build a coax dipole with 50 ohm horizontal and a center tap at 75 ohm
(f connector) to the FM tuner. or should horizontal and vertical wires be the same resistance value?
1) What "RG" Value is 50 ohms?
2) what "RG" value corresponds to 75 ohms?
3) should both wires be the same resistance?
Thanks
+David Barth
As a receiving antenna, you do not have to be too concerned about 50 or 75 ohm coax. Readily available 75 ohm coax will work just fine. Make it as shown in this video, and refer to the links posted in the video description area. Thanks.
+electronicsNmore Thank you. Which "RG" is 75 ohm?
+David Barth RG6 is a 75 ohm cable
~30 Ohms is best for power transmission, ~75 Ohms is best for noise suppression, and ~50 Ohms combines both to optimize for a little of both. ~ means numbers are rounded as the exact figures fall a couple Ohms below or above these figures.
Solder has an 'L' in it... Why not use it?!
Another Dimwit posting comments. The Brits, Aussies, and Kiwis like you that insist on telling Americans how to speak, need to see a highly qualified shrink to deal with their mental disorder.
I'm not an expert on antennas, but I would make sure it is horizontal and one end pointing toward the transmitter.
made a few of these now, as the 1/2 wave length model seems that the length are not that critical. It does work well. I have also calculated and made this into a 1/4 wave length and it worked well also. This is much better than the rubber duck antennae.
Good day, Sir. We're actually having a project on antennas and we're assigned to do the folded dipole. I just wanna clarify something about this antenna that you've made. You've mentioned here, as the video title itself, that it's actually a folded dipole antenna. I just wanna ask if this is different from the traditional 300 ohm impedance folded dipole antenna that uses folded tubes. Also, I also wanna ask about the theory behind this version of the folded dipole. We badly need an explanation on how you came up with this antenna design so that we can also explain our project during our presentation. Thank you, Sir. Hoping for your response asap. :)
Hi Shaira,
Everything you need to know is at this link:
www.nsw.wicen.org.au/technical/projects/coaxial-folded-dipole-antenna
Thanks For Watching! Be sure to share and rate Thumbs Up.
electronicsNmore Thank you for the link.
You're welcome.
what are the chances of this increasing signal level to where it's sufficient for decent stereo reception (in a place were even stick antenna is not that bad)?
Experiment. I striped seven inches of 75 Ohm coax sheathing and then separated aluminum braid off center conductor, then strips foil and insulator off center conductor. Wrap the braid around itself into a coil of braided wire and angle so both the braid and center conductor form a "T" with the remainder of coax being the vertical axis of "T". Once this is done take and bend approximately half the center conductor upwards and half the braid wrap downward. You should get reception (Mine got 71 percent reception and most channels but this was merely an experiment).
For fm radio?
Yes
I'd say my attempt at this slightly increased clarity on local FM Radio Stations but I still can't gain clarity from distant radio stations.
Should be able to. Make sure it was designed for the MIDDLE of the FM band, and placed high up on your wall behind furniture. Keep the top element horizontal. Thanks for watching!
@@electronicsNmore Hey, thanks for posting a comment to mine. I am actually shooting for FM Radio frequencies between 100MHZ to 106MHZ that are just under 75 Miles / 120km away, with a large lake and no mountains in between. Distant stations sound better with Antenna horizontally BUT IT SEEMS SENSITIVE TO DIRECTION on the horizontal plain. It's on my roof 26 feet off the ground so Maybe it's Likely that my lengths are not right.
The link to your calculator doesn't get me to that software; I had to find something else and I'm not sure lengths are right; can you give me exact lengths I need?